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For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.

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If you’re lucky, it happens right away, but for many of us it takes planning. We offer a range of tools, like our ovulation calculator and ovulation calendar, which will help you on your road to parenthood.Create your own personal fertility chart by entering your basal body temperature and other key fertility indicators.It's easy, it's fun, and most important — because it's based on your own personal information, it's the most accurate way to pinpoint your fertile time of the month! it can feel like you're going through this all alone, but there are millions of couples riding the same emotional roller coaster.Now you've got your month planned out for you, it's time to brush up on just what it takes to get pregnant.We have tons of helpful articles to inform, inspire, and assist you on your way. is pleased to collaborate with non-profit organizations such as the American Pregnancy Association who offer additional content on infertility, symptoms of pregnancy, pregnancy wellness and more.As sexual reproduction developed by way of a long process of evolution, intermediates exist.

Bacteria, for instance, reproduce asexually, but undergo a process by which a part of the genetic material of an individual (donor) is transferred to an other (recipient).

Among humans and other mammals, males typically carry XY chromosomes, whereas females typically carry XX chromosomes, which are a part of the XY sex-determination system.

Other animals have a sex-determination system as well, such as the ZW sex-determination system in birds, and the X0 sex-determination system in insects.

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Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent.